Vodacom sends me unauthorized data bundles

For a while now I keep getting messages to say I have signed up for a data bundle and to opt out if I don’t want it. Which I do every time since I DON’T WANT IT. But then I get it anyways. I have gone to the Vodacom shop to have this sorted out and they assured me that I’m not signed up for any bundles. But I got it again today. This is surely Vodacom’s way to force people to take bundles as the onus then rests on me to opt-out (which doesn’t help). I am very sure that should a customer want something they should have to sign up for it. Not opt-out should they not want it. This is a nasty trick and I’m sure you fool a lot of people into paying for things they didn’t sign up for. Because now they’ll have to “opt out” to make sure it doesn’t go through. Please look into this and stop signing me up for deals I do not want. I have phoned the store who said I must come in again. I cannot drive to a store every time you guys do this. I’m quite sure doing things this way is *******.